Change the thread interface in runtime/platform and use it starting all threads

runtime/bin/eventhandler_linux.h

Index: runtime/bin/eventhandler_linux.h
diff --git a/runtime/bin/eventhandler_linux.h b/runtime/bin/eventhandler_linux.h
index 010a33dbf444f9a65d997416b40a7d924b89af68..143f5a546b790d3301ca6c2df9d1904506a8bbc9 100644
--- a/runtime/bin/eventhandler_linux.h
+++ b/runtime/bin/eventhandler_linux.h
@@ -98,7 +98,7 @@ class EventHandlerImplementation {
   struct pollfd* GetPollFds(intptr_t* size);
   void HandleEvents(struct pollfd* pollfds, int pollfds_size, int result_size);
   void HandleTimeout();
-  static void* Poll(void* args);
+  static void Poll(uword args);
   void WakeupHandler(intptr_t id, Dart_Port dart_port, int64_t data);
   void HandleInterruptFd();
   void SetPort(intptr_t fd, Dart_Port dart_port, intptr_t mask);